Boiler-fire-box construction.



2 SHEETSSHEET 2.

Patented Dec. 19, 1911.

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G. L. HUSTON. BOILER FIRE BOX CONSTRUCTION.

APPLICATION FILED SEPT. 26, 1911.

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UNITED sTArpsg ngE T OFFICE.

CHARLES L. I-IUSTON, 0F COATESVILLE, PENNSYLVANIA, ASSIGNOR TO JACOBS- SHUPERT U. S. FIRE BOX COMPANY, OF GOATESVILLE, PENNSYLVANIA, A

CORPORATION OF PENNSYLVANIA.

BOILER-FIRE-BOX CONSTR UCTION.

Specification of Letters Patent.

Patented Dec. 19, 1911.

To all whom it may concern:

Be it known that I, CHARLES L. ITUSI'ON, a citizen of the United States, residing in Coatesville, county of Chester, State of Pennsylvania, have invented certain Improvements in Boiler- Fire Box Construction, of which the following is a specification.

My invention relates to certain improvements in the construction of fire boxes, especially the fire boxes of boilers of the locomotive type.

The object of my invention is to construct the fire box so that the joint between the mud ring and the inner plates of the fire box will be substantial and readily calked.

In the accompanying drawings :-Figure 1, is a transverse sectional view of a locomotive boiler fire box illustrating my improve ment; Fig. 2, is a side view of the inner lining of the fire box; Fig. 3, is a sectional elevation on the line aa Fig. 1; Fig. 4, is a sectional plan view on the line ?)-Z), Fig. 3; Fig. 5, is a sectional view on the line 0-0, Fig. 3; Fig. 6, is a sectional view on the line Z-cl, Fig. 3; Fig. 7 is a detached side view of the lower portion of one of the plates of the inner fire box casing; Fig. 8, is a side view of one of my improved coupling plates; Fig. 9, is an edge view of the plate illustrated in Fig. 8; and Fig. 10, is a perspective view of the plate.

My invention relates particularly to the type of the boxes made of a plurality of sections, one example of which is shown in the patent granted to H. WV. Jacobs and F. WV. Shupert, No. 917,172, dated April (3th, 1909. A fire box of this construction consists of two series of U-shaped plates con.

nected together by stay plates. The U-shaped plates are in the form of channels having a body portion and flanges.

In the present instance the space between the inner and outer shells is greater above the crown than at each side, although this portion may be varied without departing from the essential features of the invention. Each outer section consists of a body 1 having flanges 2, and each inner section has a body 1 having flanges 5. The two sets of plates are connected by stay plates 3 which are secured to the flanges of the other plates by rivets or other fastening means.

The mud ring 6 is located between the lower ends of the inner and outer plates and this mud ring is firmly secured to both the inner and outer plates by rivets or other suitable fastenings. The outer plates are made in the ordinary manner and in this type of boiler the plates terminate in the full width of the lower end of the mud rings and secured to the ring by rivets 7. The lower ends of the inner plates 4t are shaped as illustrated in Figs. 2 and 7; being cut away at each side and beveled to form a tongue 8. The edges of the plates terminate at a point above the mud ring,

while the tongue 8 is secured to the mud ring by the rivets 7.

Ilcretot'ore the inner plates were elaborately shaped to make the joint between the plates and the mud ring water and steam tight, and to give the plates the necessary strength at this vital point of the boiler. l simplify the construction of the plates by securing to said plates a coupling plate 9, shown clearly in Figs. 8, 9 and 10, each coupling plate reinforcing the inner plates 4, as well as making simple and effective joints between the said inner plates and the mud ring. This coupling plate 9 is shaped as shown in Fig. 8, and has a series of rivet holes which aline with the rivet holes in the plate and the mud ring. Rivets 10 pass through the holes of the coupling plate and the inner plates 1, while the rivets 7 pass through not only the holes in the mud ring and outer plates, but also through the holes in the inner plates and the coupling plates, making a very substantial and tight joint. The coupling plate 9 has a projecting socket 11, which is U-shaped and extends up on each side of the flanges 5 of the inner plates 4:, and a rivet 12 passes through the holes in the walls of the socket member and through a hole in the flanges 5, as well as through a hole in the stay plate 3. The rivets 13 secure the stay plates to the flanges 5 of the plates l.

It will be noticed that the edges 1.4; of each coupling plate abut one against another and the height of the plate at this point is equal to the height of the mud ring, so that the joint between the mud ring and these several coupling plates is perfectly rigid and is closed by calking, while the joint between the coupling plates and the plates 4 is calked on the lines :11

and y, Fig. 3 In the event of leakage at any of these points, the joints 3 can be readily re-calked without dismantling the structure.

By the above construction, the inner fire box plates are reinforced at the point where strength is most desirable and the plates can be more readily assembled than in a construction where the joint is made entirely by the overlapping of the inner plates.

By making the separate plates with U- shaped pockets, I am enabled to calk the fire box lining from the fire side and force the metal of the stay plates into the pockets, making a very tight joint.

By making the separate coupling plates as shown I am enabled to simplify the construction of the fire box and at the same time am enabled to make the pieces in large reducing the cost of the boiler and insuring the p'erfect calking of the fire box at the mud ring.

While I have shown my invention as applied to a fire box having inner and outer sets of channel plates, it will be understood that the invention resides wholly in the construct-ion of the fire box lining, outer wall of the boiler may be made of plain sheets if found desirable.

I claim l. The combination in a fire box, of flanged fire box lining plates; a mud ring and coupling plates at the junction of the lining plates with themud ring; and secured to both the mud ring and to the said lining plates.

2. The combination in a fire box, of a series of lining plates; a mud ring to which the lower ends of the said plates are secured; coupling plates having their edges abutting at the side of the mud ring; with means for securing the said coupling plates to both the mud ring and the lining plates.

3. The combination in a fire box, of a .series of flanged lining plates; a mud ring and the mounted between the lining plates and the mud ring; said coupling plates having sockets for the reception of the lower ends of the flanges of the lining plates.

5. The combination of a fire box, flanged firebox lining plates having downwardly extending tongues, a mud ring, stay plates mounted between the flanges of the first mentioned plates, and coupling plates secured to the mud ring and to the lining plates, and having pockets for the reception of the flanges of the lining plates andthe edge of the stay plates.

6. The combination in a fire box, of inner lining plates inclosing the fire box; outer plates forming the shell of the boiler and extending over the lining plates; a mud ring to which both the inner and outer plates are secured; the outer plates'having external flanges; the inner lining plates having flanges extending into the space between the inner and outer plates; stay plates mounted between the flanges of the said plates and extending from one series of plates to the other; a series of coupling plates mounted, between the inner lining plates and the mud ring; and having sockets projecting into the space between the inner and outer plates; the walls of the said sockets extending on each side of the lower ends of the flanges of the inner lining plates; with means for securing the several plates together.

7. A boiler having a fire box therein, consisting of a series of outer flanged plates forming the shell of the boiler and inner flanged plates forming the lining of the fire box; a mud ring to which both sets of plates are secured; the flanges of the inner plates projecting into the space between the inner and outer plates and terminating short of the mud ring; with coupling plates below the ends of the flanges and located between the mud drum and the inner lining plates; said coupling plates abutting each other and secured to both the mud drum and said lining plates.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CHARLES L. HUSTON.

Witnesses:

l/VM. E. SHUPE, WM. A. BARR.

Copies of th s patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

